GUJCET 2023 Physics Solved Paper

Figure shows 2.0V potentiometer used for the determination of internal resistance of 1.5V cell. The balance point of cell in open circuit is 77.4‌cm. When a resistor of 9.6Ω is used in the external circuit of the cell, the balanced point shifts to 64.5‌cm length of the potentiometer wire. The internal resistance of the cell is ___________ Ω